If you put keywords such as 'ESL TEFL English Lesson' into youtube you can find a lot of teachers who have filmed themselves explaining grammar, pron etc. They're not usually full "lessons" as such but could help you with structuring explanations, for example
http://www.youtube.com/user/RebeccaESL#p/a/u/2/RoHCUX5P0ow
Good luck!